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Thanks both, it was the totally ground base compared to the paperweight I had that threw me. Yes the stopper would not be able to be more than 12mm to fit the bottle, oddly a search on ebay shows two stoppers sold recently on their own although they look much thicker than would fit mine, and too big at 75mm.

The thicker shaft stoppers may indicate that Richardsons learned how fragile the thin ones were - and yet the thick ones are still broken off!

Regarding the age of your bottle, that is a difficult question. I think the ones from around 1900 - 1910 tend to have a foot rim, and often have an outer ring of white quatrefoil canes, and an overall lighter colouration. I have had a few darker weights, often not quite as well finished, and I suspect they are from an earlier period. I feel your bottle is an earlier piece, too. The problem is that might be anywhere from the 1850s to 1890s, and I do not know of any evidence to tie these pieces in to a specific date.